earthquakes & volcanoes

1. molten rock that issues from a volcano.
4. a fracture along which the blocks of crust on either side have moved relative to one another parallel to the fracture.
6. a large underground pool of molten rock found beneath the surface of the Earth
9. the hypothesis that the Earth's continents have moved over geologic time relative to each other
10. a supercontinent that existed during the late Paleozoic and early Mesozoic eras.
12. a scientific theory that explains how major landforms are created as a result of Earth's subterranean movements.
13. a giant wave caused by an earthquake on the ocean floor
14. he is most notable for his theory of continental drift
15. a path along the Pacific Ocean characterized by active volcanoes and frequent earthquakes

2. an opening in the earth's crust through which lava, volcanic ash, and gases escape.
3. the sudden movement or trembling of the Earth's tectonic plates.
5. the study of earthquakes
7. an underwater mountain range formed by plate tectonics.
8. a tectonic plate at the bottom of the oceans.
11. instrument used to measure earthquakes